Molding-machine



P. W. GATES.

' MOLDING MACHINE. APPLICATION HLED nAYlo. 1920."

1,385,676. Patented July 26, 1921.

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MAW/MWL aiya P. W. GATES.

'MoLmNG MACHINE. APPLICATION FILED MAY 10, 1920.

Patented July 26, 1921.

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illmliiilmm Mmm WHW

P. w. GATES.

Mowme momma.

APPLICATION lFILED MAY $0, 1920.

Patented July 26, 1921.

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V E A Wwf/@ UNITED STATES PATENT OFFICE..

PHILETUS W. GATES, OF EVANSTON, ILLINOIS, ASSIGNOR 'IO MUMFOBD MOLDING MACHINE COMPANY, A CORPORATION OF NEW JERSEY.

MOLDING-MAGI-IINE.

Application filed. May 10,

T 0 @ZZ w 7mm t may concern:

Be it known that I, PHILETUs W. GATES, a citizen of the United States, residing at Evanston, in the county of Cook and State or' Illinois, have invented certain new and useful Improvements in Molding-Machines, of which the following` is a speciiication.

This invention relates to improvements in molding machines and has for its object to provide anew and improved type of combination machine, as it is termed, el. e., a machine which will perform both jol'ting and squeezing operations.

In my improved machine I am enabled to utilize a single plunger coacting with a cylinder having a central upstanding post without locating the jolt valve mechanism upon said post, but otherwise compactly locating it so that it may be readily removed for inspection or test without requiring the disassembling of the entire machine.

Another advantage of my improved niachine lies in the fact that I provide constant communication between the inner jolting cylinder and the recess in the plunger into which the automatic jolt valve projects, thereby preventing premature closing of the jolt valve, as will be more fully described.

These and other objects will be-more fully set forth and described in the accompanying drawings in which- Figure 1 is a vertical section of my improved machine, a portion of the jolt valve being shown in elevation.

. Fig. 2 is a rear elevation of the same.

Fig. 3 is a detail section along the line 3-'3 of Fig. 4;. f

Fig. 4 is a horizontal section along the line 4 4 of Fig. 2.

Like numerals refer to like elements throughout the drawings in which 10 indi'- cates generally a hollow base member having a supporting ilange 10a upon which rests and is secured the cylinder and piston mechanism described below. This mechanism comprises a inain cylinder 11 having Speecaton of Letters Patent. Patented J 1y 25', 1921.

1920. Serial No. 380,119.

ford-Huggins type, briefly, comprising an air inlet 15a and an air outlet 15b. At its inner portion the block is further provided with the chambers 15G, 15d connected by a vertical passage 15e lhaving the valve seat 15f. The vertical reciprocable valve 15er is provided, shown as in open position in Fig. 1 of the drawings. A bleed passage 15h leads to the space beneath the valve 15g and the latter is further provided with an upwardly extending stem 15i projecting above the valve block 15.

The operation of this valve is as follows: Air being supplied through the inlet 15L to the chamber 15, it will iiow through the passage 15e to the chamber 15d from whence it will liow out through the outlet, 15b. During this flow of air the pressure on the lower side of the valve 15g is slightly less than on its upper surface and the valve will remain in open position due to this diflerence in pressure and the weight oi the valve.v When the inlet 11d is closed by the plunger 20, flow through the passage 15b ceases, and pressure beneath the valve 15g immediately builds up through the medium o'f the bleed passage 15h and, owing to the excess ot pressure at the lower side of the valve 15g. the latter is forced upwardly to the seat 15f closing the flow of air through the passage 150 until such time as the valve is positively moved back to open position.

Reciprocably mounted in the cylinder 11 is the piston or plunger 2O carrying the table 21, which may carry such other superstructure as is desirable, such as the pattern plate, lifting frame, etc., not forming a part of the present invention. The plunger 20 is provided with the central bore or cylin-y der portion 20a closely fitting the upstand-v in'g post 12a to reciprocate thereon. This upstanding post and the cylinder portion 2Oa of the plunger 20 constitute the jolting cylinder while air is admitted from any desirable source through the port 12d in the 'cylinder bottom for squeezing. the effect of this air, as is obvious, being to lift the plunger 20.

A cavity or elongated chamber 25 is provided in the plunger 20, see Figs. 1 and 4. The inner end of the valve block 15 projects into this cavity, as shown in Fig. 1.v A'

stud 26 is carried-.by the plunger 2()` over the valve stem 15? being so arranged as to strike the same on the downward movement of the plunger `to positively move the valve 15g to open position. F rom the outlet leads a short duct or tube 27, see Figs. 2 and t, to an inlet port 111 on the wall of the cylinder 11, which in turn is in comn'iunication -with the port d in the plunger 20. The port 20*L also serves to provide communication between the cylindrical portion 2OEL and the cavity 25. Wlien the plunger 2() lifts suliiciently to close the inlet port 11d, see Fig. 3, for example, the air functions to immediately close the valve 15g, cutting off further supply of air tothe cylinder 20. Expansion of the entrappcd air as well as the momentum of the arising plungerV suf- 15 fices to carry the port 2()d into communication with the outlet 11c whereupon a large portion of the compressed air in the cylinder 2Oa escapes through the inlet 11e and the weight of the plunger and mechanism supported thereby is suflicient to diop the same to a jolting impact during which drop the stud 26 positively moves the valve stein 15i and valve 15g to open position whereupon the cycle is repeated. By providing communication through the medium of the inlet 2Od between the cavity 25 and the cylindrical poi-tion 20, the pressure on the former will be the same as that on the latter and ,consequently the pressure acting upon the upper portion of the valve stem 15 is that obtaining in the jolting cylinder. Were this communication not provided the pressure on the cavity 25 would be substantially atmospheric and the pressure acting on the upper surface of the valve 15g would be sufficient to prematurely blow the valve up to position closing the outlet 15b, thereby cutting off the vsupply of operating fluid to the j olting cylinder prematurely.

For squeezing, air is admitted, as explained above, from any desired `source through the port 12d, for example, and acts upon the bottom of the plunger 2O to lift the same until the supply] is cut off and exhaust permitted by a manually-operated twoway valve, for example, not shown. When the machine is jolting, the squeezing valve is left open to relieve and prevent suction beneath the plunger 20.

I find it desirable to leave the jolt inlet 15a open to the atmosphere during the squeezing operation in order to eliminate suction in the cylinder 20a, this control being permitted by a valve structure similar to that shown in the patent to Krause 1,828,527, patented January 20, 1920. Y v

It will be obvious that in my mechanism I provide twoY separate cylinders, lalthough I use but a single main plunger and cylinder, but at the same time I so locate my jolt valve 15 that it may be readily removed` and inspected 0r repaired without requiring the removal of the lunger 20, as in the case of prior devices. imilarly, 'it is not necessary in my structure to carry air supply pipes or ducts upwardly through the post 12a and ally of the necessary pipe is So located as to be readily accessible and not buried in the mechanism as in the cases of prior devices of this nature.

It will be obvious that my invention is susceptible of numerous modifications and improvements and Ido not wish to be restricted to the form shown and described except as defined in the appended claims.

What I claim is :-V 1. In a machine of the class described, a

Vmain cylinder provided with a central upstanding` post, a plunger reciprocably mounted in said cylinder and having a cylindrical portion reciprocating on said post, said'plunger being recessed, an automatic jolting valve projecting into said recess, and means to supply fluid under pressure tothe interior of said cylindrical portion of said plunger, said Supply being automatically controlled by said jolt valve.

2. In a machine of the class described, a main cylinder provided with central upstanding post, a plunger ,reciprocably mounted in said cylinder and having a cylindrical portion reciprocating on said post,

saidY plunger being recessed, an automatic jolting valve projecting into said recess, and

means to supply fluid under pressure to the interior of said cylindrical portion of said plunger, said supply being automatically controlled by said jolt valve, said cylindrical portion and said cavity vbeing in communication. Y

3. In a machine of the class described, a cylinder having an internal upstanding post, a plunger reciprocably mounted vin said cylinder and having a portion reciprocating upon said post, means to supply fluid under pressure to said portion above said post, said means comprising an inlet, said plunger being further provided with a cavity,

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and a jolt valve projecting into said cavity and controlling the flow of operating fluid to said inlet, said inlet being also in communication with said cavity.

4. In a machine of the class described, a cylinder having an internal upstanding post, a plunger reciprocably mounted in said cylinder and having a portion reciprocating upon said post, means to supply fluidk un-v der pressure to said portion above said post, said last-named means comprising an inlet, said plunger being further provided with c a cavity and jolt valve mechanism projecting thereinto and controlling the flow of operating fluid to said inlet, said cavity being in communication with the portion of said plunger reciprocating upon said post whereb substantially the same pressure will obtain in both locations.

In testimony whereof I have subscribed` my name.

PHILE'IUS W. GATES. 

